orion-ecs / keen-eye / 20042079419

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Add RenderSystem tests for improved coverage

Add comprehensive tests for RenderSystem covering:
- Initialization with/without GraphicsContext
- Camera selection (MainCameraTag priority, fallback)
- Clear buffer operations (color, depth, both)
- Depth test and culling enablement
- Directional light handling
- Render queue sorting by layer
- Material and texture binding
- Invalid mesh ID handling
- Cleanup operations after rendering

623 of 626 branches covered (99.52%)

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3544 of 3612 relevant lines covered (98.12%)

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